138430236 has 48 divisors (see below), whose sum is σ = 369734400. Its totient is φ = 39488640.

The previous prime is 138430231. The next prime is 138430247. The reversal of 138430236 is 632034831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138430231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87331 + ... + 88901.

It is an arithmetic number, because the mean of its divisors is an integer number (7702800).

Almost surely, 2^138430236 is an apocalyptic number.

It is an amenable number.

138430236 is an abundant number, since it is smaller than the sum of its proper divisors (231304164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138430236 is a wasteful number, since it uses less digits than its factorization.

138430236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2634 (or 2632 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 138430236 is about 11765.6379342558. The cubic root of 138430236 is about 517.3013992065.

The spelling of 138430236 in words is "one hundred thirty-eight million, four hundred thirty thousand, two hundred thirty-six".